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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
597603d6 JK |
2 | /* |
3 | * Loopback soundcard | |
4 | * | |
5 | * Original code: | |
6 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> | |
7 | * | |
8 | * More accurate positioning and full-duplex support: | |
9 | * Copyright (c) Ahmet İnan <ainan at mathematik.uni-freiburg.de> | |
10 | * | |
11 | * Major (almost complete) rewrite: | |
12 | * Copyright (c) by Takashi Iwai <tiwai@suse.de> | |
13 | * | |
14 | * A next major update in 2010 (separate timers for playback and capture): | |
15 | * Copyright (c) Jaroslav Kysela <perex@perex.cz> | |
597603d6 JK |
16 | */ |
17 | ||
18 | #include <linux/init.h> | |
19 | #include <linux/jiffies.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/time.h> | |
22 | #include <linux/wait.h> | |
65a77217 | 23 | #include <linux/module.h> |
597603d6 JK |
24 | #include <linux/platform_device.h> |
25 | #include <sound/core.h> | |
26 | #include <sound/control.h> | |
27 | #include <sound/pcm.h> | |
b088b53e | 28 | #include <sound/pcm_params.h> |
e74670b6 | 29 | #include <sound/info.h> |
597603d6 | 30 | #include <sound/initval.h> |
26c53379 | 31 | #include <sound/timer.h> |
597603d6 JK |
32 | |
33 | MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); | |
34 | MODULE_DESCRIPTION("A loopback soundcard"); | |
35 | MODULE_LICENSE("GPL"); | |
597603d6 JK |
36 | |
37 | #define MAX_PCM_SUBSTREAMS 8 | |
38 | ||
39 | static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ | |
40 | static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ | |
a67ff6a5 | 41 | static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0}; |
597603d6 JK |
42 | static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8}; |
43 | static int pcm_notify[SNDRV_CARDS]; | |
26c53379 | 44 | static char *timer_source[SNDRV_CARDS]; |
597603d6 JK |
45 | |
46 | module_param_array(index, int, NULL, 0444); | |
47 | MODULE_PARM_DESC(index, "Index value for loopback soundcard."); | |
48 | module_param_array(id, charp, NULL, 0444); | |
49 | MODULE_PARM_DESC(id, "ID string for loopback soundcard."); | |
50 | module_param_array(enable, bool, NULL, 0444); | |
51 | MODULE_PARM_DESC(enable, "Enable this loopback soundcard."); | |
52 | module_param_array(pcm_substreams, int, NULL, 0444); | |
53 | MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-8) for loopback driver."); | |
54 | module_param_array(pcm_notify, int, NULL, 0444); | |
55 | MODULE_PARM_DESC(pcm_notify, "Break capture when PCM format/rate/channels changes."); | |
26c53379 TW |
56 | module_param_array(timer_source, charp, NULL, 0444); |
57 | MODULE_PARM_DESC(timer_source, "Sound card name or number and device/subdevice number of timer to be used. Empty string for jiffies timer [default]."); | |
597603d6 JK |
58 | |
59 | #define NO_PITCH 100000 | |
60 | ||
fd1f7c74 TW |
61 | #define CABLE_VALID_PLAYBACK BIT(SNDRV_PCM_STREAM_PLAYBACK) |
62 | #define CABLE_VALID_CAPTURE BIT(SNDRV_PCM_STREAM_CAPTURE) | |
63 | #define CABLE_VALID_BOTH (CABLE_VALID_PLAYBACK | CABLE_VALID_CAPTURE) | |
64 | ||
133f3759 | 65 | struct loopback_cable; |
597603d6 JK |
66 | struct loopback_pcm; |
67 | ||
133f3759 TW |
68 | struct loopback_ops { |
69 | /* optional | |
70 | * call in loopback->cable_lock | |
71 | */ | |
72 | int (*open)(struct loopback_pcm *dpcm); | |
73 | /* required | |
74 | * call in cable->lock | |
75 | */ | |
76 | int (*start)(struct loopback_pcm *dpcm); | |
77 | /* required | |
78 | * call in cable->lock | |
79 | */ | |
80 | int (*stop)(struct loopback_pcm *dpcm); | |
81 | /* optional */ | |
82 | int (*stop_sync)(struct loopback_pcm *dpcm); | |
83 | /* optional */ | |
84 | int (*close_substream)(struct loopback_pcm *dpcm); | |
85 | /* optional | |
86 | * call in loopback->cable_lock | |
87 | */ | |
88 | int (*close_cable)(struct loopback_pcm *dpcm); | |
89 | /* optional | |
90 | * call in cable->lock | |
91 | */ | |
92 | unsigned int (*pos_update)(struct loopback_cable *cable); | |
93 | /* optional */ | |
94 | void (*dpcm_info)(struct loopback_pcm *dpcm, | |
95 | struct snd_info_buffer *buffer); | |
96 | }; | |
97 | ||
597603d6 JK |
98 | struct loopback_cable { |
99 | spinlock_t lock; | |
100 | struct loopback_pcm *streams[2]; | |
101 | struct snd_pcm_hardware hw; | |
102 | /* flags */ | |
103 | unsigned int valid; | |
104 | unsigned int running; | |
5de9e45f | 105 | unsigned int pause; |
133f3759 | 106 | /* timer specific */ |
e714fa93 | 107 | const struct loopback_ops *ops; |
26c53379 TW |
108 | /* If sound timer is used */ |
109 | struct { | |
110 | int stream; | |
111 | struct snd_timer_id id; | |
6053a712 | 112 | struct work_struct event_work; |
26c53379 TW |
113 | struct snd_timer_instance *instance; |
114 | } snd_timer; | |
597603d6 JK |
115 | }; |
116 | ||
117 | struct loopback_setup { | |
118 | unsigned int notify: 1; | |
119 | unsigned int rate_shift; | |
8c356c52 | 120 | snd_pcm_format_t format; |
597603d6 JK |
121 | unsigned int rate; |
122 | unsigned int channels; | |
123 | struct snd_ctl_elem_id active_id; | |
124 | struct snd_ctl_elem_id format_id; | |
125 | struct snd_ctl_elem_id rate_id; | |
126 | struct snd_ctl_elem_id channels_id; | |
127 | }; | |
128 | ||
129 | struct loopback { | |
130 | struct snd_card *card; | |
131 | struct mutex cable_lock; | |
132 | struct loopback_cable *cables[MAX_PCM_SUBSTREAMS][2]; | |
133 | struct snd_pcm *pcm[2]; | |
134 | struct loopback_setup setup[MAX_PCM_SUBSTREAMS][2]; | |
26c53379 | 135 | const char *timer_source; |
597603d6 JK |
136 | }; |
137 | ||
138 | struct loopback_pcm { | |
139 | struct loopback *loopback; | |
140 | struct snd_pcm_substream *substream; | |
141 | struct loopback_cable *cable; | |
142 | unsigned int pcm_buffer_size; | |
143 | unsigned int buf_pos; /* position in buffer */ | |
144 | unsigned int silent_size; | |
145 | /* PCM parameters */ | |
146 | unsigned int pcm_period_size; | |
147 | unsigned int pcm_bps; /* bytes per second */ | |
148 | unsigned int pcm_salign; /* bytes per sample * channels */ | |
149 | unsigned int pcm_rate_shift; /* rate shift value */ | |
150 | /* flags */ | |
151 | unsigned int period_update_pending :1; | |
152 | /* timer stuff */ | |
97dda3da TW |
153 | unsigned int irq_pos; /* fractional IRQ position in jiffies |
154 | * ticks | |
155 | */ | |
156 | unsigned int period_size_frac; /* period size in jiffies ticks */ | |
b012513c | 157 | unsigned int last_drift; |
597603d6 | 158 | unsigned long last_jiffies; |
26c53379 | 159 | /* If jiffies timer is used */ |
597603d6 JK |
160 | struct timer_list timer; |
161 | }; | |
162 | ||
163 | static struct platform_device *devices[SNDRV_CARDS]; | |
164 | ||
165 | static inline unsigned int byte_pos(struct loopback_pcm *dpcm, unsigned int x) | |
166 | { | |
167 | if (dpcm->pcm_rate_shift == NO_PITCH) { | |
168 | x /= HZ; | |
169 | } else { | |
170 | x = div_u64(NO_PITCH * (unsigned long long)x, | |
171 | HZ * (unsigned long long)dpcm->pcm_rate_shift); | |
172 | } | |
173 | return x - (x % dpcm->pcm_salign); | |
174 | } | |
175 | ||
176 | static inline unsigned int frac_pos(struct loopback_pcm *dpcm, unsigned int x) | |
177 | { | |
178 | if (dpcm->pcm_rate_shift == NO_PITCH) { /* no pitch */ | |
179 | return x * HZ; | |
180 | } else { | |
181 | x = div_u64(dpcm->pcm_rate_shift * (unsigned long long)x * HZ, | |
182 | NO_PITCH); | |
183 | } | |
184 | return x; | |
185 | } | |
186 | ||
187 | static inline struct loopback_setup *get_setup(struct loopback_pcm *dpcm) | |
188 | { | |
189 | int device = dpcm->substream->pstr->pcm->device; | |
190 | ||
191 | if (dpcm->substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
192 | device ^= 1; | |
193 | return &dpcm->loopback->setup[dpcm->substream->number][device]; | |
194 | } | |
195 | ||
196 | static inline unsigned int get_notify(struct loopback_pcm *dpcm) | |
197 | { | |
198 | return get_setup(dpcm)->notify; | |
199 | } | |
200 | ||
201 | static inline unsigned int get_rate_shift(struct loopback_pcm *dpcm) | |
202 | { | |
203 | return get_setup(dpcm)->rate_shift; | |
204 | } | |
205 | ||
999fc9f6 | 206 | /* call in cable->lock */ |
8e3bf7cd | 207 | static int loopback_jiffies_timer_start(struct loopback_pcm *dpcm) |
597603d6 JK |
208 | { |
209 | unsigned long tick; | |
210 | unsigned int rate_shift = get_rate_shift(dpcm); | |
211 | ||
212 | if (rate_shift != dpcm->pcm_rate_shift) { | |
213 | dpcm->pcm_rate_shift = rate_shift; | |
214 | dpcm->period_size_frac = frac_pos(dpcm, dpcm->pcm_period_size); | |
215 | } | |
0db71023 JK |
216 | if (dpcm->period_size_frac <= dpcm->irq_pos) { |
217 | dpcm->irq_pos %= dpcm->period_size_frac; | |
218 | dpcm->period_update_pending = 1; | |
219 | } | |
597603d6 | 220 | tick = dpcm->period_size_frac - dpcm->irq_pos; |
7ef74bdc | 221 | tick = DIV_ROUND_UP(tick, dpcm->pcm_bps); |
db974553 | 222 | mod_timer(&dpcm->timer, jiffies + tick); |
09419f1a TW |
223 | |
224 | return 0; | |
597603d6 JK |
225 | } |
226 | ||
26c53379 TW |
227 | /* call in cable->lock */ |
228 | static int loopback_snd_timer_start(struct loopback_pcm *dpcm) | |
229 | { | |
230 | struct loopback_cable *cable = dpcm->cable; | |
231 | int err; | |
232 | ||
233 | /* Loopback device has to use same period as timer card. Therefore | |
234 | * wake up for each snd_pcm_period_elapsed() call of timer card. | |
235 | */ | |
236 | err = snd_timer_start(cable->snd_timer.instance, 1); | |
237 | if (err < 0) { | |
238 | /* do not report error if trying to start but already | |
239 | * running. For example called by opposite substream | |
240 | * of the same cable | |
241 | */ | |
242 | if (err == -EBUSY) | |
243 | return 0; | |
244 | ||
245 | pcm_err(dpcm->substream->pcm, | |
246 | "snd_timer_start(%d,%d,%d) failed with %d", | |
247 | cable->snd_timer.id.card, | |
248 | cable->snd_timer.id.device, | |
249 | cable->snd_timer.id.subdevice, | |
250 | err); | |
251 | } | |
252 | ||
253 | return err; | |
254 | } | |
255 | ||
999fc9f6 | 256 | /* call in cable->lock */ |
8e3bf7cd | 257 | static inline int loopback_jiffies_timer_stop(struct loopback_pcm *dpcm) |
597603d6 JK |
258 | { |
259 | del_timer(&dpcm->timer); | |
e74670b6 | 260 | dpcm->timer.expires = 0; |
09419f1a TW |
261 | |
262 | return 0; | |
597603d6 JK |
263 | } |
264 | ||
26c53379 TW |
265 | /* call in cable->lock */ |
266 | static int loopback_snd_timer_stop(struct loopback_pcm *dpcm) | |
267 | { | |
268 | struct loopback_cable *cable = dpcm->cable; | |
269 | int err; | |
270 | ||
271 | /* only stop if both devices (playback and capture) are not running */ | |
272 | if (cable->running ^ cable->pause) | |
273 | return 0; | |
274 | ||
275 | err = snd_timer_stop(cable->snd_timer.instance); | |
276 | if (err < 0) { | |
277 | pcm_err(dpcm->substream->pcm, | |
278 | "snd_timer_stop(%d,%d,%d) failed with %d", | |
279 | cable->snd_timer.id.card, | |
280 | cable->snd_timer.id.device, | |
281 | cable->snd_timer.id.subdevice, | |
282 | err); | |
283 | } | |
284 | ||
285 | return err; | |
286 | } | |
287 | ||
8e3bf7cd | 288 | static inline int loopback_jiffies_timer_stop_sync(struct loopback_pcm *dpcm) |
67a01afa TI |
289 | { |
290 | del_timer_sync(&dpcm->timer); | |
09419f1a TW |
291 | |
292 | return 0; | |
67a01afa TI |
293 | } |
294 | ||
26c53379 TW |
295 | /* call in loopback->cable_lock */ |
296 | static int loopback_snd_timer_close_cable(struct loopback_pcm *dpcm) | |
297 | { | |
298 | struct loopback_cable *cable = dpcm->cable; | |
299 | ||
300 | /* snd_timer was not opened */ | |
301 | if (!cable->snd_timer.instance) | |
302 | return 0; | |
303 | ||
26c53379 TW |
304 | /* will only be called from free_cable() when other stream was |
305 | * already closed. Other stream cannot be reopened as long as | |
306 | * loopback->cable_lock is locked. Therefore no need to lock | |
307 | * cable->lock; | |
308 | */ | |
309 | snd_timer_close(cable->snd_timer.instance); | |
9314e44f | 310 | |
6053a712 TI |
311 | /* wait till drain work has finished if requested */ |
312 | cancel_work_sync(&cable->snd_timer.event_work); | |
9314e44f | 313 | |
26c53379 TW |
314 | snd_timer_instance_free(cable->snd_timer.instance); |
315 | memset(&cable->snd_timer, 0, sizeof(cable->snd_timer)); | |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
597603d6 JK |
320 | static int loopback_check_format(struct loopback_cable *cable, int stream) |
321 | { | |
b1c73fc8 | 322 | struct snd_pcm_runtime *runtime, *cruntime; |
597603d6 JK |
323 | struct loopback_setup *setup; |
324 | struct snd_card *card; | |
325 | int check; | |
326 | ||
327 | if (cable->valid != CABLE_VALID_BOTH) { | |
328 | if (stream == SNDRV_PCM_STREAM_PLAYBACK) | |
329 | goto __notify; | |
330 | return 0; | |
331 | } | |
332 | runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]-> | |
333 | substream->runtime; | |
b1c73fc8 JK |
334 | cruntime = cable->streams[SNDRV_PCM_STREAM_CAPTURE]-> |
335 | substream->runtime; | |
336 | check = runtime->format != cruntime->format || | |
337 | runtime->rate != cruntime->rate || | |
338 | runtime->channels != cruntime->channels; | |
597603d6 JK |
339 | if (!check) |
340 | return 0; | |
341 | if (stream == SNDRV_PCM_STREAM_CAPTURE) { | |
342 | return -EIO; | |
343 | } else { | |
344 | snd_pcm_stop(cable->streams[SNDRV_PCM_STREAM_CAPTURE]-> | |
345 | substream, SNDRV_PCM_STATE_DRAINING); | |
346 | __notify: | |
347 | runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]-> | |
348 | substream->runtime; | |
349 | setup = get_setup(cable->streams[SNDRV_PCM_STREAM_PLAYBACK]); | |
350 | card = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]->loopback->card; | |
351 | if (setup->format != runtime->format) { | |
352 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, | |
353 | &setup->format_id); | |
354 | setup->format = runtime->format; | |
355 | } | |
356 | if (setup->rate != runtime->rate) { | |
357 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, | |
358 | &setup->rate_id); | |
359 | setup->rate = runtime->rate; | |
360 | } | |
361 | if (setup->channels != runtime->channels) { | |
362 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, | |
363 | &setup->channels_id); | |
364 | setup->channels = runtime->channels; | |
365 | } | |
366 | } | |
367 | return 0; | |
368 | } | |
369 | ||
370 | static void loopback_active_notify(struct loopback_pcm *dpcm) | |
371 | { | |
372 | snd_ctl_notify(dpcm->loopback->card, | |
373 | SNDRV_CTL_EVENT_MASK_VALUE, | |
374 | &get_setup(dpcm)->active_id); | |
375 | } | |
376 | ||
377 | static int loopback_trigger(struct snd_pcm_substream *substream, int cmd) | |
378 | { | |
379 | struct snd_pcm_runtime *runtime = substream->runtime; | |
380 | struct loopback_pcm *dpcm = runtime->private_data; | |
381 | struct loopback_cable *cable = dpcm->cable; | |
09419f1a | 382 | int err = 0, stream = 1 << substream->stream; |
597603d6 JK |
383 | |
384 | switch (cmd) { | |
385 | case SNDRV_PCM_TRIGGER_START: | |
386 | err = loopback_check_format(cable, substream->stream); | |
387 | if (err < 0) | |
388 | return err; | |
389 | dpcm->last_jiffies = jiffies; | |
390 | dpcm->pcm_rate_shift = 0; | |
b012513c | 391 | dpcm->last_drift = 0; |
dd04bb12 | 392 | spin_lock(&cable->lock); |
5de9e45f JK |
393 | cable->running |= stream; |
394 | cable->pause &= ~stream; | |
133f3759 | 395 | err = cable->ops->start(dpcm); |
999fc9f6 | 396 | spin_unlock(&cable->lock); |
597603d6 JK |
397 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
398 | loopback_active_notify(dpcm); | |
399 | break; | |
400 | case SNDRV_PCM_TRIGGER_STOP: | |
dd04bb12 | 401 | spin_lock(&cable->lock); |
5de9e45f JK |
402 | cable->running &= ~stream; |
403 | cable->pause &= ~stream; | |
133f3759 | 404 | err = cable->ops->stop(dpcm); |
999fc9f6 | 405 | spin_unlock(&cable->lock); |
597603d6 JK |
406 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
407 | loopback_active_notify(dpcm); | |
408 | break; | |
5de9e45f | 409 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
edac8943 | 410 | case SNDRV_PCM_TRIGGER_SUSPEND: |
5de9e45f JK |
411 | spin_lock(&cable->lock); |
412 | cable->pause |= stream; | |
133f3759 | 413 | err = cable->ops->stop(dpcm); |
999fc9f6 | 414 | spin_unlock(&cable->lock); |
306a4f3c RR |
415 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
416 | loopback_active_notify(dpcm); | |
5de9e45f JK |
417 | break; |
418 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
edac8943 | 419 | case SNDRV_PCM_TRIGGER_RESUME: |
5de9e45f JK |
420 | spin_lock(&cable->lock); |
421 | dpcm->last_jiffies = jiffies; | |
422 | cable->pause &= ~stream; | |
133f3759 | 423 | err = cable->ops->start(dpcm); |
999fc9f6 | 424 | spin_unlock(&cable->lock); |
306a4f3c RR |
425 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
426 | loopback_active_notify(dpcm); | |
5de9e45f | 427 | break; |
597603d6 JK |
428 | default: |
429 | return -EINVAL; | |
430 | } | |
09419f1a | 431 | return err; |
597603d6 JK |
432 | } |
433 | ||
b1c73fc8 JK |
434 | static void params_change(struct snd_pcm_substream *substream) |
435 | { | |
436 | struct snd_pcm_runtime *runtime = substream->runtime; | |
437 | struct loopback_pcm *dpcm = runtime->private_data; | |
438 | struct loopback_cable *cable = dpcm->cable; | |
439 | ||
74c34ca1 | 440 | cable->hw.formats = pcm_format_to_bits(runtime->format); |
b1c73fc8 JK |
441 | cable->hw.rate_min = runtime->rate; |
442 | cable->hw.rate_max = runtime->rate; | |
443 | cable->hw.channels_min = runtime->channels; | |
444 | cable->hw.channels_max = runtime->channels; | |
26c53379 TW |
445 | |
446 | if (cable->snd_timer.instance) { | |
447 | cable->hw.period_bytes_min = | |
448 | frames_to_bytes(runtime, runtime->period_size); | |
449 | cable->hw.period_bytes_max = cable->hw.period_bytes_min; | |
450 | } | |
451 | ||
b1c73fc8 JK |
452 | } |
453 | ||
597603d6 JK |
454 | static int loopback_prepare(struct snd_pcm_substream *substream) |
455 | { | |
456 | struct snd_pcm_runtime *runtime = substream->runtime; | |
457 | struct loopback_pcm *dpcm = runtime->private_data; | |
458 | struct loopback_cable *cable = dpcm->cable; | |
09419f1a | 459 | int err, bps, salign; |
597603d6 | 460 | |
133f3759 TW |
461 | if (cable->ops->stop_sync) { |
462 | err = cable->ops->stop_sync(dpcm); | |
463 | if (err < 0) | |
464 | return err; | |
465 | } | |
67a01afa | 466 | |
50e09084 | 467 | salign = (snd_pcm_format_physical_width(runtime->format) * |
597603d6 JK |
468 | runtime->channels) / 8; |
469 | bps = salign * runtime->rate; | |
470 | if (bps <= 0 || salign <= 0) | |
471 | return -EINVAL; | |
472 | ||
473 | dpcm->buf_pos = 0; | |
474 | dpcm->pcm_buffer_size = frames_to_bytes(runtime, runtime->buffer_size); | |
475 | if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { | |
476 | /* clear capture buffer */ | |
477 | dpcm->silent_size = dpcm->pcm_buffer_size; | |
478 | snd_pcm_format_set_silence(runtime->format, runtime->dma_area, | |
479 | runtime->buffer_size * runtime->channels); | |
480 | } | |
481 | ||
482 | dpcm->irq_pos = 0; | |
483 | dpcm->period_update_pending = 0; | |
484 | dpcm->pcm_bps = bps; | |
485 | dpcm->pcm_salign = salign; | |
486 | dpcm->pcm_period_size = frames_to_bytes(runtime, runtime->period_size); | |
487 | ||
488 | mutex_lock(&dpcm->loopback->cable_lock); | |
b1c73fc8 JK |
489 | if (!(cable->valid & ~(1 << substream->stream)) || |
490 | (get_setup(dpcm)->notify && | |
491 | substream->stream == SNDRV_PCM_STREAM_PLAYBACK)) | |
492 | params_change(substream); | |
597603d6 JK |
493 | cable->valid |= 1 << substream->stream; |
494 | mutex_unlock(&dpcm->loopback->cable_lock); | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
499 | static void clear_capture_buf(struct loopback_pcm *dpcm, unsigned int bytes) | |
500 | { | |
501 | struct snd_pcm_runtime *runtime = dpcm->substream->runtime; | |
502 | char *dst = runtime->dma_area; | |
503 | unsigned int dst_off = dpcm->buf_pos; | |
504 | ||
505 | if (dpcm->silent_size >= dpcm->pcm_buffer_size) | |
506 | return; | |
507 | if (dpcm->silent_size + bytes > dpcm->pcm_buffer_size) | |
508 | bytes = dpcm->pcm_buffer_size - dpcm->silent_size; | |
509 | ||
510 | for (;;) { | |
511 | unsigned int size = bytes; | |
512 | if (dst_off + size > dpcm->pcm_buffer_size) | |
513 | size = dpcm->pcm_buffer_size - dst_off; | |
514 | snd_pcm_format_set_silence(runtime->format, dst + dst_off, | |
515 | bytes_to_frames(runtime, size) * | |
516 | runtime->channels); | |
517 | dpcm->silent_size += size; | |
518 | bytes -= size; | |
519 | if (!bytes) | |
520 | break; | |
521 | dst_off = 0; | |
522 | } | |
523 | } | |
524 | ||
525 | static void copy_play_buf(struct loopback_pcm *play, | |
526 | struct loopback_pcm *capt, | |
527 | unsigned int bytes) | |
528 | { | |
529 | struct snd_pcm_runtime *runtime = play->substream->runtime; | |
20d9a26d | 530 | char *src = runtime->dma_area; |
597603d6 JK |
531 | char *dst = capt->substream->runtime->dma_area; |
532 | unsigned int src_off = play->buf_pos; | |
533 | unsigned int dst_off = capt->buf_pos; | |
534 | unsigned int clear_bytes = 0; | |
535 | ||
536 | /* check if playback is draining, trim the capture copy size | |
537 | * when our pointer is at the end of playback ring buffer */ | |
538 | if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && | |
539 | snd_pcm_playback_hw_avail(runtime) < runtime->buffer_size) { | |
540 | snd_pcm_uframes_t appl_ptr, appl_ptr1, diff; | |
541 | appl_ptr = appl_ptr1 = runtime->control->appl_ptr; | |
542 | appl_ptr1 -= appl_ptr1 % runtime->buffer_size; | |
543 | appl_ptr1 += play->buf_pos / play->pcm_salign; | |
544 | if (appl_ptr < appl_ptr1) | |
545 | appl_ptr1 -= runtime->buffer_size; | |
546 | diff = (appl_ptr - appl_ptr1) * play->pcm_salign; | |
547 | if (diff < bytes) { | |
548 | clear_bytes = bytes - diff; | |
549 | bytes = diff; | |
550 | } | |
551 | } | |
552 | ||
553 | for (;;) { | |
554 | unsigned int size = bytes; | |
555 | if (src_off + size > play->pcm_buffer_size) | |
556 | size = play->pcm_buffer_size - src_off; | |
557 | if (dst_off + size > capt->pcm_buffer_size) | |
558 | size = capt->pcm_buffer_size - dst_off; | |
559 | memcpy(dst + dst_off, src + src_off, size); | |
560 | capt->silent_size = 0; | |
561 | bytes -= size; | |
562 | if (!bytes) | |
563 | break; | |
564 | src_off = (src_off + size) % play->pcm_buffer_size; | |
565 | dst_off = (dst_off + size) % capt->pcm_buffer_size; | |
566 | } | |
567 | ||
20d9a26d | 568 | if (clear_bytes > 0) { |
597603d6 | 569 | clear_capture_buf(capt, clear_bytes); |
20d9a26d JK |
570 | capt->silent_size = 0; |
571 | } | |
597603d6 JK |
572 | } |
573 | ||
b012513c JK |
574 | static inline unsigned int bytepos_delta(struct loopback_pcm *dpcm, |
575 | unsigned int jiffies_delta) | |
597603d6 | 576 | { |
597603d6 | 577 | unsigned long last_pos; |
b012513c | 578 | unsigned int delta; |
597603d6 JK |
579 | |
580 | last_pos = byte_pos(dpcm, dpcm->irq_pos); | |
b012513c JK |
581 | dpcm->irq_pos += jiffies_delta * dpcm->pcm_bps; |
582 | delta = byte_pos(dpcm, dpcm->irq_pos) - last_pos; | |
583 | if (delta >= dpcm->last_drift) | |
584 | delta -= dpcm->last_drift; | |
585 | dpcm->last_drift = 0; | |
597603d6 JK |
586 | if (dpcm->irq_pos >= dpcm->period_size_frac) { |
587 | dpcm->irq_pos %= dpcm->period_size_frac; | |
588 | dpcm->period_update_pending = 1; | |
589 | } | |
b012513c JK |
590 | return delta; |
591 | } | |
592 | ||
593 | static inline void bytepos_finish(struct loopback_pcm *dpcm, | |
594 | unsigned int delta) | |
595 | { | |
596 | dpcm->buf_pos += delta; | |
597 | dpcm->buf_pos %= dpcm->pcm_buffer_size; | |
597603d6 JK |
598 | } |
599 | ||
999fc9f6 | 600 | /* call in cable->lock */ |
8e3bf7cd TW |
601 | static unsigned int loopback_jiffies_timer_pos_update |
602 | (struct loopback_cable *cable) | |
597603d6 JK |
603 | { |
604 | struct loopback_pcm *dpcm_play = | |
605 | cable->streams[SNDRV_PCM_STREAM_PLAYBACK]; | |
606 | struct loopback_pcm *dpcm_capt = | |
607 | cable->streams[SNDRV_PCM_STREAM_CAPTURE]; | |
608 | unsigned long delta_play = 0, delta_capt = 0; | |
b012513c | 609 | unsigned int running, count1, count2; |
597603d6 | 610 | |
5de9e45f | 611 | running = cable->running ^ cable->pause; |
dd04bb12 | 612 | if (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) { |
597603d6 JK |
613 | delta_play = jiffies - dpcm_play->last_jiffies; |
614 | dpcm_play->last_jiffies += delta_play; | |
615 | } | |
616 | ||
dd04bb12 | 617 | if (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) { |
597603d6 JK |
618 | delta_capt = jiffies - dpcm_capt->last_jiffies; |
619 | dpcm_capt->last_jiffies += delta_capt; | |
620 | } | |
621 | ||
98d21df4 TI |
622 | if (delta_play == 0 && delta_capt == 0) |
623 | goto unlock; | |
597603d6 JK |
624 | |
625 | if (delta_play > delta_capt) { | |
b012513c JK |
626 | count1 = bytepos_delta(dpcm_play, delta_play - delta_capt); |
627 | bytepos_finish(dpcm_play, count1); | |
597603d6 JK |
628 | delta_play = delta_capt; |
629 | } else if (delta_play < delta_capt) { | |
b012513c JK |
630 | count1 = bytepos_delta(dpcm_capt, delta_capt - delta_play); |
631 | clear_capture_buf(dpcm_capt, count1); | |
632 | bytepos_finish(dpcm_capt, count1); | |
597603d6 JK |
633 | delta_capt = delta_play; |
634 | } | |
635 | ||
98d21df4 TI |
636 | if (delta_play == 0 && delta_capt == 0) |
637 | goto unlock; | |
638 | ||
597603d6 | 639 | /* note delta_capt == delta_play at this moment */ |
b012513c JK |
640 | count1 = bytepos_delta(dpcm_play, delta_play); |
641 | count2 = bytepos_delta(dpcm_capt, delta_capt); | |
642 | if (count1 < count2) { | |
643 | dpcm_capt->last_drift = count2 - count1; | |
644 | count1 = count2; | |
645 | } else if (count1 > count2) { | |
646 | dpcm_play->last_drift = count1 - count2; | |
647 | } | |
648 | copy_play_buf(dpcm_play, dpcm_capt, count1); | |
649 | bytepos_finish(dpcm_play, count1); | |
650 | bytepos_finish(dpcm_capt, count1); | |
98d21df4 | 651 | unlock: |
dd04bb12 | 652 | return running; |
597603d6 JK |
653 | } |
654 | ||
8e3bf7cd | 655 | static void loopback_jiffies_timer_function(struct timer_list *t) |
597603d6 | 656 | { |
bc47ba90 | 657 | struct loopback_pcm *dpcm = from_timer(dpcm, t, timer); |
999fc9f6 | 658 | unsigned long flags; |
597603d6 | 659 | |
999fc9f6 | 660 | spin_lock_irqsave(&dpcm->cable->lock, flags); |
8e3bf7cd TW |
661 | if (loopback_jiffies_timer_pos_update(dpcm->cable) & |
662 | (1 << dpcm->substream->stream)) { | |
663 | loopback_jiffies_timer_start(dpcm); | |
dd04bb12 JK |
664 | if (dpcm->period_update_pending) { |
665 | dpcm->period_update_pending = 0; | |
999fc9f6 TI |
666 | spin_unlock_irqrestore(&dpcm->cable->lock, flags); |
667 | /* need to unlock before calling below */ | |
597603d6 | 668 | snd_pcm_period_elapsed(dpcm->substream); |
999fc9f6 | 669 | return; |
dd04bb12 | 670 | } |
597603d6 | 671 | } |
999fc9f6 | 672 | spin_unlock_irqrestore(&dpcm->cable->lock, flags); |
597603d6 JK |
673 | } |
674 | ||
26c53379 TW |
675 | /* call in cable->lock */ |
676 | static int loopback_snd_timer_check_resolution(struct snd_pcm_runtime *runtime, | |
677 | unsigned long resolution) | |
678 | { | |
679 | if (resolution != runtime->timer_resolution) { | |
680 | struct loopback_pcm *dpcm = runtime->private_data; | |
681 | struct loopback_cable *cable = dpcm->cable; | |
682 | /* Worst case estimation of possible values for resolution | |
683 | * resolution <= (512 * 1024) frames / 8kHz in nsec | |
684 | * resolution <= 65.536.000.000 nsec | |
685 | * | |
686 | * period_size <= 65.536.000.000 nsec / 1000nsec/usec * 192kHz + | |
687 | * 500.000 | |
688 | * period_size <= 12.582.912.000.000 <64bit | |
689 | * / 1.000.000 usec/sec | |
690 | */ | |
691 | snd_pcm_uframes_t period_size_usec = | |
692 | resolution / 1000 * runtime->rate; | |
693 | /* round to nearest sample rate */ | |
694 | snd_pcm_uframes_t period_size = | |
695 | (period_size_usec + 500 * 1000) / (1000 * 1000); | |
696 | ||
697 | pcm_err(dpcm->substream->pcm, | |
698 | "Period size (%lu frames) of loopback device is not corresponding to timer resolution (%lu nsec = %lu frames) of card timer %d,%d,%d. Use period size of %lu frames for loopback device.", | |
699 | runtime->period_size, resolution, period_size, | |
700 | cable->snd_timer.id.card, | |
701 | cable->snd_timer.id.device, | |
702 | cable->snd_timer.id.subdevice, | |
703 | period_size); | |
704 | return -EINVAL; | |
705 | } | |
706 | return 0; | |
707 | } | |
708 | ||
709 | static void loopback_snd_timer_period_elapsed(struct loopback_cable *cable, | |
710 | int event, | |
711 | unsigned long resolution) | |
712 | { | |
713 | struct loopback_pcm *dpcm_play, *dpcm_capt; | |
714 | struct snd_pcm_substream *substream_play, *substream_capt; | |
715 | struct snd_pcm_runtime *valid_runtime; | |
716 | unsigned int running, elapsed_bytes; | |
717 | unsigned long flags; | |
718 | ||
719 | spin_lock_irqsave(&cable->lock, flags); | |
720 | running = cable->running ^ cable->pause; | |
721 | /* no need to do anything if no stream is running */ | |
722 | if (!running) { | |
723 | spin_unlock_irqrestore(&cable->lock, flags); | |
724 | return; | |
725 | } | |
726 | ||
727 | dpcm_play = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]; | |
728 | dpcm_capt = cable->streams[SNDRV_PCM_STREAM_CAPTURE]; | |
26c53379 TW |
729 | |
730 | if (event == SNDRV_TIMER_EVENT_MSTOP) { | |
731 | if (!dpcm_play || | |
732 | dpcm_play->substream->runtime->status->state != | |
733 | SNDRV_PCM_STATE_DRAINING) { | |
734 | spin_unlock_irqrestore(&cable->lock, flags); | |
735 | return; | |
736 | } | |
737 | } | |
738 | ||
5061bb70 AG |
739 | substream_play = (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ? |
740 | dpcm_play->substream : NULL; | |
741 | substream_capt = (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) ? | |
742 | dpcm_capt->substream : NULL; | |
26c53379 TW |
743 | valid_runtime = (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ? |
744 | dpcm_play->substream->runtime : | |
745 | dpcm_capt->substream->runtime; | |
746 | ||
747 | /* resolution is only valid for SNDRV_TIMER_EVENT_TICK events */ | |
748 | if (event == SNDRV_TIMER_EVENT_TICK) { | |
749 | /* The hardware rules guarantee that playback and capture period | |
750 | * are the same. Therefore only one device has to be checked | |
751 | * here. | |
752 | */ | |
753 | if (loopback_snd_timer_check_resolution(valid_runtime, | |
754 | resolution) < 0) { | |
755 | spin_unlock_irqrestore(&cable->lock, flags); | |
756 | if (substream_play) | |
757 | snd_pcm_stop_xrun(substream_play); | |
758 | if (substream_capt) | |
759 | snd_pcm_stop_xrun(substream_capt); | |
760 | return; | |
761 | } | |
762 | } | |
763 | ||
764 | elapsed_bytes = frames_to_bytes(valid_runtime, | |
765 | valid_runtime->period_size); | |
766 | /* The same timer interrupt is used for playback and capture device */ | |
767 | if ((running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) && | |
768 | (running & (1 << SNDRV_PCM_STREAM_CAPTURE))) { | |
769 | copy_play_buf(dpcm_play, dpcm_capt, elapsed_bytes); | |
770 | bytepos_finish(dpcm_play, elapsed_bytes); | |
771 | bytepos_finish(dpcm_capt, elapsed_bytes); | |
772 | } else if (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) { | |
773 | bytepos_finish(dpcm_play, elapsed_bytes); | |
774 | } else if (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) { | |
775 | clear_capture_buf(dpcm_capt, elapsed_bytes); | |
776 | bytepos_finish(dpcm_capt, elapsed_bytes); | |
777 | } | |
778 | spin_unlock_irqrestore(&cable->lock, flags); | |
779 | ||
780 | if (substream_play) | |
781 | snd_pcm_period_elapsed(substream_play); | |
782 | if (substream_capt) | |
783 | snd_pcm_period_elapsed(substream_capt); | |
784 | } | |
785 | ||
786 | static void loopback_snd_timer_function(struct snd_timer_instance *timeri, | |
787 | unsigned long resolution, | |
788 | unsigned long ticks) | |
789 | { | |
790 | struct loopback_cable *cable = timeri->callback_data; | |
791 | ||
792 | loopback_snd_timer_period_elapsed(cable, SNDRV_TIMER_EVENT_TICK, | |
793 | resolution); | |
794 | } | |
795 | ||
6053a712 | 796 | static void loopback_snd_timer_work(struct work_struct *work) |
26c53379 | 797 | { |
6053a712 | 798 | struct loopback_cable *cable; |
26c53379 | 799 | |
6053a712 | 800 | cable = container_of(work, struct loopback_cable, snd_timer.event_work); |
26c53379 TW |
801 | loopback_snd_timer_period_elapsed(cable, SNDRV_TIMER_EVENT_MSTOP, 0); |
802 | } | |
803 | ||
804 | static void loopback_snd_timer_event(struct snd_timer_instance *timeri, | |
805 | int event, | |
fcae40c9 | 806 | struct timespec64 *tstamp, |
26c53379 TW |
807 | unsigned long resolution) |
808 | { | |
809 | /* Do not lock cable->lock here because timer->lock is already hold. | |
810 | * There are other functions which first lock cable->lock and than | |
811 | * timer->lock e.g. | |
812 | * loopback_trigger() | |
813 | * spin_lock(&cable->lock) | |
814 | * loopback_snd_timer_start() | |
815 | * snd_timer_start() | |
816 | * spin_lock(&timer->lock) | |
817 | * Therefore when using the oposit order of locks here it could result | |
818 | * in a deadlock. | |
819 | */ | |
820 | ||
821 | if (event == SNDRV_TIMER_EVENT_MSTOP) { | |
822 | struct loopback_cable *cable = timeri->callback_data; | |
823 | ||
824 | /* sound card of the timer was stopped. Therefore there will not | |
825 | * be any further timer callbacks. Due to this forward audio | |
826 | * data from here if in draining state. When still in running | |
827 | * state the streaming will be aborted by the usual timeout. It | |
828 | * should not be aborted here because may be the timer sound | |
829 | * card does only a recovery and the timer is back soon. | |
6053a712 | 830 | * This work triggers loopback_snd_timer_work() |
26c53379 | 831 | */ |
6053a712 | 832 | schedule_work(&cable->snd_timer.event_work); |
26c53379 TW |
833 | } |
834 | } | |
835 | ||
133f3759 TW |
836 | static void loopback_jiffies_timer_dpcm_info(struct loopback_pcm *dpcm, |
837 | struct snd_info_buffer *buffer) | |
838 | { | |
839 | snd_iprintf(buffer, " update_pending:\t%u\n", | |
840 | dpcm->period_update_pending); | |
841 | snd_iprintf(buffer, " irq_pos:\t\t%u\n", dpcm->irq_pos); | |
842 | snd_iprintf(buffer, " period_frac:\t%u\n", dpcm->period_size_frac); | |
843 | snd_iprintf(buffer, " last_jiffies:\t%lu (%lu)\n", | |
844 | dpcm->last_jiffies, jiffies); | |
845 | snd_iprintf(buffer, " timer_expires:\t%lu\n", dpcm->timer.expires); | |
846 | } | |
847 | ||
26c53379 TW |
848 | static void loopback_snd_timer_dpcm_info(struct loopback_pcm *dpcm, |
849 | struct snd_info_buffer *buffer) | |
850 | { | |
851 | struct loopback_cable *cable = dpcm->cable; | |
852 | ||
853 | snd_iprintf(buffer, " sound timer:\thw:%d,%d,%d\n", | |
854 | cable->snd_timer.id.card, | |
855 | cable->snd_timer.id.device, | |
856 | cable->snd_timer.id.subdevice); | |
857 | snd_iprintf(buffer, " timer open:\t\t%s\n", | |
858 | (cable->snd_timer.stream == SNDRV_PCM_STREAM_CAPTURE) ? | |
859 | "capture" : "playback"); | |
860 | } | |
861 | ||
597603d6 JK |
862 | static snd_pcm_uframes_t loopback_pointer(struct snd_pcm_substream *substream) |
863 | { | |
864 | struct snd_pcm_runtime *runtime = substream->runtime; | |
865 | struct loopback_pcm *dpcm = runtime->private_data; | |
999fc9f6 | 866 | snd_pcm_uframes_t pos; |
597603d6 | 867 | |
999fc9f6 | 868 | spin_lock(&dpcm->cable->lock); |
133f3759 TW |
869 | if (dpcm->cable->ops->pos_update) |
870 | dpcm->cable->ops->pos_update(dpcm->cable); | |
999fc9f6 TI |
871 | pos = dpcm->buf_pos; |
872 | spin_unlock(&dpcm->cable->lock); | |
873 | return bytes_to_frames(runtime, pos); | |
597603d6 JK |
874 | } |
875 | ||
b6c0b715 | 876 | static const struct snd_pcm_hardware loopback_pcm_hardware = |
597603d6 JK |
877 | { |
878 | .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP | | |
edac8943 TI |
879 | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE | |
880 | SNDRV_PCM_INFO_RESUME), | |
597603d6 | 881 | .formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | |
50e09084 TW |
882 | SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE | |
883 | SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE | | |
597603d6 JK |
884 | SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE | |
885 | SNDRV_PCM_FMTBIT_FLOAT_LE | SNDRV_PCM_FMTBIT_FLOAT_BE), | |
886 | .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_192000, | |
887 | .rate_min = 8000, | |
888 | .rate_max = 192000, | |
889 | .channels_min = 1, | |
890 | .channels_max = 32, | |
891 | .buffer_bytes_max = 2 * 1024 * 1024, | |
892 | .period_bytes_min = 64, | |
0db71023 JK |
893 | /* note check overflow in frac_pos() using pcm_rate_shift before |
894 | changing period_bytes_max value */ | |
895 | .period_bytes_max = 1024 * 1024, | |
597603d6 JK |
896 | .periods_min = 1, |
897 | .periods_max = 1024, | |
898 | .fifo_size = 0, | |
899 | }; | |
900 | ||
901 | static void loopback_runtime_free(struct snd_pcm_runtime *runtime) | |
902 | { | |
903 | struct loopback_pcm *dpcm = runtime->private_data; | |
904 | kfree(dpcm); | |
905 | } | |
906 | ||
597603d6 JK |
907 | static int loopback_hw_free(struct snd_pcm_substream *substream) |
908 | { | |
909 | struct snd_pcm_runtime *runtime = substream->runtime; | |
910 | struct loopback_pcm *dpcm = runtime->private_data; | |
911 | struct loopback_cable *cable = dpcm->cable; | |
912 | ||
913 | mutex_lock(&dpcm->loopback->cable_lock); | |
914 | cable->valid &= ~(1 << substream->stream); | |
915 | mutex_unlock(&dpcm->loopback->cable_lock); | |
39729889 | 916 | return 0; |
597603d6 JK |
917 | } |
918 | ||
919 | static unsigned int get_cable_index(struct snd_pcm_substream *substream) | |
920 | { | |
921 | if (!substream->pcm->device) | |
922 | return substream->stream; | |
923 | else | |
924 | return !substream->stream; | |
925 | } | |
926 | ||
b1c73fc8 JK |
927 | static int rule_format(struct snd_pcm_hw_params *params, |
928 | struct snd_pcm_hw_rule *rule) | |
929 | { | |
898dfe46 TI |
930 | struct loopback_pcm *dpcm = rule->private; |
931 | struct loopback_cable *cable = dpcm->cable; | |
b088b53e | 932 | struct snd_mask m; |
b1c73fc8 | 933 | |
b088b53e | 934 | snd_mask_none(&m); |
898dfe46 TI |
935 | mutex_lock(&dpcm->loopback->cable_lock); |
936 | m.bits[0] = (u_int32_t)cable->hw.formats; | |
937 | m.bits[1] = (u_int32_t)(cable->hw.formats >> 32); | |
938 | mutex_unlock(&dpcm->loopback->cable_lock); | |
b088b53e | 939 | return snd_mask_refine(hw_param_mask(params, rule->var), &m); |
b1c73fc8 JK |
940 | } |
941 | ||
942 | static int rule_rate(struct snd_pcm_hw_params *params, | |
943 | struct snd_pcm_hw_rule *rule) | |
944 | { | |
898dfe46 TI |
945 | struct loopback_pcm *dpcm = rule->private; |
946 | struct loopback_cable *cable = dpcm->cable; | |
b1c73fc8 JK |
947 | struct snd_interval t; |
948 | ||
898dfe46 TI |
949 | mutex_lock(&dpcm->loopback->cable_lock); |
950 | t.min = cable->hw.rate_min; | |
951 | t.max = cable->hw.rate_max; | |
952 | mutex_unlock(&dpcm->loopback->cable_lock); | |
b1c73fc8 JK |
953 | t.openmin = t.openmax = 0; |
954 | t.integer = 0; | |
955 | return snd_interval_refine(hw_param_interval(params, rule->var), &t); | |
956 | } | |
957 | ||
958 | static int rule_channels(struct snd_pcm_hw_params *params, | |
959 | struct snd_pcm_hw_rule *rule) | |
960 | { | |
898dfe46 TI |
961 | struct loopback_pcm *dpcm = rule->private; |
962 | struct loopback_cable *cable = dpcm->cable; | |
b1c73fc8 JK |
963 | struct snd_interval t; |
964 | ||
898dfe46 TI |
965 | mutex_lock(&dpcm->loopback->cable_lock); |
966 | t.min = cable->hw.channels_min; | |
967 | t.max = cable->hw.channels_max; | |
968 | mutex_unlock(&dpcm->loopback->cable_lock); | |
b1c73fc8 JK |
969 | t.openmin = t.openmax = 0; |
970 | t.integer = 0; | |
971 | return snd_interval_refine(hw_param_interval(params, rule->var), &t); | |
972 | } | |
973 | ||
26c53379 TW |
974 | static int rule_period_bytes(struct snd_pcm_hw_params *params, |
975 | struct snd_pcm_hw_rule *rule) | |
976 | { | |
977 | struct loopback_pcm *dpcm = rule->private; | |
978 | struct loopback_cable *cable = dpcm->cable; | |
979 | struct snd_interval t; | |
980 | ||
981 | mutex_lock(&dpcm->loopback->cable_lock); | |
982 | t.min = cable->hw.period_bytes_min; | |
983 | t.max = cable->hw.period_bytes_max; | |
984 | mutex_unlock(&dpcm->loopback->cable_lock); | |
985 | t.openmin = 0; | |
986 | t.openmax = 0; | |
987 | t.integer = 0; | |
988 | return snd_interval_refine(hw_param_interval(params, rule->var), &t); | |
989 | } | |
990 | ||
9685347a TI |
991 | static void free_cable(struct snd_pcm_substream *substream) |
992 | { | |
993 | struct loopback *loopback = substream->private_data; | |
994 | int dev = get_cable_index(substream); | |
995 | struct loopback_cable *cable; | |
996 | ||
997 | cable = loopback->cables[substream->number][dev]; | |
998 | if (!cable) | |
999 | return; | |
1000 | if (cable->streams[!substream->stream]) { | |
1001 | /* other stream is still alive */ | |
8e6b1a72 | 1002 | spin_lock_irq(&cable->lock); |
9685347a | 1003 | cable->streams[substream->stream] = NULL; |
8e6b1a72 | 1004 | spin_unlock_irq(&cable->lock); |
9685347a | 1005 | } else { |
133f3759 TW |
1006 | struct loopback_pcm *dpcm = substream->runtime->private_data; |
1007 | ||
1008 | if (cable->ops && cable->ops->close_cable && dpcm) | |
1009 | cable->ops->close_cable(dpcm); | |
9685347a TI |
1010 | /* free the cable */ |
1011 | loopback->cables[substream->number][dev] = NULL; | |
1012 | kfree(cable); | |
1013 | } | |
1014 | } | |
1015 | ||
133f3759 TW |
1016 | static int loopback_jiffies_timer_open(struct loopback_pcm *dpcm) |
1017 | { | |
8e3bf7cd | 1018 | timer_setup(&dpcm->timer, loopback_jiffies_timer_function, 0); |
133f3759 TW |
1019 | |
1020 | return 0; | |
1021 | } | |
1022 | ||
e714fa93 | 1023 | static const struct loopback_ops loopback_jiffies_timer_ops = { |
133f3759 | 1024 | .open = loopback_jiffies_timer_open, |
8e3bf7cd TW |
1025 | .start = loopback_jiffies_timer_start, |
1026 | .stop = loopback_jiffies_timer_stop, | |
1027 | .stop_sync = loopback_jiffies_timer_stop_sync, | |
1028 | .close_substream = loopback_jiffies_timer_stop_sync, | |
1029 | .pos_update = loopback_jiffies_timer_pos_update, | |
133f3759 TW |
1030 | .dpcm_info = loopback_jiffies_timer_dpcm_info, |
1031 | }; | |
1032 | ||
26c53379 TW |
1033 | static int loopback_parse_timer_id(const char *str, |
1034 | struct snd_timer_id *tid) | |
1035 | { | |
1036 | /* [<pref>:](<card name>|<card idx>)[{.,}<dev idx>[{.,}<subdev idx>]] */ | |
1037 | const char * const sep_dev = ".,"; | |
1038 | const char * const sep_pref = ":"; | |
1039 | const char *name = str; | |
1040 | char *sep, save = '\0'; | |
1041 | int card_idx = 0, dev = 0, subdev = 0; | |
1042 | int err; | |
1043 | ||
1044 | sep = strpbrk(str, sep_pref); | |
1045 | if (sep) | |
1046 | name = sep + 1; | |
1047 | sep = strpbrk(name, sep_dev); | |
1048 | if (sep) { | |
1049 | save = *sep; | |
1050 | *sep = '\0'; | |
1051 | } | |
1052 | err = kstrtoint(name, 0, &card_idx); | |
1053 | if (err == -EINVAL) { | |
1054 | /* Must be the name, not number */ | |
1055 | for (card_idx = 0; card_idx < snd_ecards_limit; card_idx++) { | |
1056 | struct snd_card *card = snd_card_ref(card_idx); | |
1057 | ||
1058 | if (card) { | |
1059 | if (!strcmp(card->id, name)) | |
1060 | err = 0; | |
1061 | snd_card_unref(card); | |
1062 | } | |
1063 | if (!err) | |
1064 | break; | |
1065 | } | |
1066 | } | |
1067 | if (sep) { | |
1068 | *sep = save; | |
1069 | if (!err) { | |
1070 | char *sep2, save2 = '\0'; | |
1071 | ||
1072 | sep2 = strpbrk(sep + 1, sep_dev); | |
1073 | if (sep2) { | |
1074 | save2 = *sep2; | |
1075 | *sep2 = '\0'; | |
1076 | } | |
1077 | err = kstrtoint(sep + 1, 0, &dev); | |
1078 | if (sep2) { | |
1079 | *sep2 = save2; | |
1080 | if (!err) | |
1081 | err = kstrtoint(sep2 + 1, 0, &subdev); | |
1082 | } | |
1083 | } | |
1084 | } | |
1085 | if (!err && tid) { | |
1086 | tid->card = card_idx; | |
1087 | tid->device = dev; | |
1088 | tid->subdevice = subdev; | |
1089 | } | |
1090 | return err; | |
1091 | } | |
1092 | ||
1093 | /* call in loopback->cable_lock */ | |
1094 | static int loopback_snd_timer_open(struct loopback_pcm *dpcm) | |
1095 | { | |
1096 | int err = 0; | |
1097 | struct snd_timer_id tid = { | |
1098 | .dev_class = SNDRV_TIMER_CLASS_PCM, | |
1099 | .dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION, | |
1100 | }; | |
1101 | struct snd_timer_instance *timeri; | |
1102 | struct loopback_cable *cable = dpcm->cable; | |
1103 | ||
26c53379 TW |
1104 | /* check if timer was already opened. It is only opened once |
1105 | * per playback and capture subdevice (aka cable). | |
1106 | */ | |
1107 | if (cable->snd_timer.instance) | |
c037239c | 1108 | goto exit; |
26c53379 TW |
1109 | |
1110 | err = loopback_parse_timer_id(dpcm->loopback->timer_source, &tid); | |
1111 | if (err < 0) { | |
1112 | pcm_err(dpcm->substream->pcm, | |
1113 | "Parsing timer source \'%s\' failed with %d", | |
1114 | dpcm->loopback->timer_source, err); | |
c037239c | 1115 | goto exit; |
26c53379 TW |
1116 | } |
1117 | ||
1118 | cable->snd_timer.stream = dpcm->substream->stream; | |
1119 | cable->snd_timer.id = tid; | |
1120 | ||
1121 | timeri = snd_timer_instance_new(dpcm->loopback->card->id); | |
1122 | if (!timeri) { | |
1123 | err = -ENOMEM; | |
c037239c | 1124 | goto exit; |
26c53379 | 1125 | } |
6053a712 | 1126 | /* The callback has to be called from another work. If |
26c53379 TW |
1127 | * SNDRV_TIMER_IFLG_FAST is specified it will be called from the |
1128 | * snd_pcm_period_elapsed() call of the selected sound card. | |
1129 | * snd_pcm_period_elapsed() helds snd_pcm_stream_lock_irqsave(). | |
1130 | * Due to our callback loopback_snd_timer_function() also calls | |
1131 | * snd_pcm_period_elapsed() which calls snd_pcm_stream_lock_irqsave(). | |
1132 | * This would end up in a dead lock. | |
1133 | */ | |
1134 | timeri->flags |= SNDRV_TIMER_IFLG_AUTO; | |
1135 | timeri->callback = loopback_snd_timer_function; | |
1136 | timeri->callback_data = (void *)cable; | |
1137 | timeri->ccallback = loopback_snd_timer_event; | |
1138 | ||
6053a712 TI |
1139 | /* initialise a work used for draining */ |
1140 | INIT_WORK(&cable->snd_timer.event_work, loopback_snd_timer_work); | |
26c53379 | 1141 | |
c037239c AG |
1142 | /* The mutex loopback->cable_lock is kept locked. |
1143 | * Therefore snd_timer_open() cannot be called a second time | |
1144 | * by the other device of the same cable. | |
26c53379 TW |
1145 | * Therefore the following issue cannot happen: |
1146 | * [proc1] Call loopback_timer_open() -> | |
1147 | * Unlock cable->lock for snd_timer_close/open() call | |
1148 | * [proc2] Call loopback_timer_open() -> snd_timer_open(), | |
1149 | * snd_timer_start() | |
1150 | * [proc1] Call snd_timer_open() and overwrite running timer | |
1151 | * instance | |
1152 | */ | |
26c53379 | 1153 | err = snd_timer_open(timeri, &cable->snd_timer.id, current->pid); |
26c53379 TW |
1154 | if (err < 0) { |
1155 | pcm_err(dpcm->substream->pcm, | |
1156 | "snd_timer_open (%d,%d,%d) failed with %d", | |
1157 | cable->snd_timer.id.card, | |
1158 | cable->snd_timer.id.device, | |
1159 | cable->snd_timer.id.subdevice, | |
1160 | err); | |
1161 | snd_timer_instance_free(timeri); | |
c037239c | 1162 | goto exit; |
26c53379 TW |
1163 | } |
1164 | ||
1165 | cable->snd_timer.instance = timeri; | |
1166 | ||
c037239c | 1167 | exit: |
26c53379 TW |
1168 | return err; |
1169 | } | |
1170 | ||
1171 | /* stop_sync() is not required for sound timer because it does not need to be | |
1172 | * restarted in loopback_prepare() on Xrun recovery | |
1173 | */ | |
e714fa93 | 1174 | static const struct loopback_ops loopback_snd_timer_ops = { |
26c53379 TW |
1175 | .open = loopback_snd_timer_open, |
1176 | .start = loopback_snd_timer_start, | |
1177 | .stop = loopback_snd_timer_stop, | |
1178 | .close_cable = loopback_snd_timer_close_cable, | |
1179 | .dpcm_info = loopback_snd_timer_dpcm_info, | |
1180 | }; | |
1181 | ||
597603d6 JK |
1182 | static int loopback_open(struct snd_pcm_substream *substream) |
1183 | { | |
1184 | struct snd_pcm_runtime *runtime = substream->runtime; | |
1185 | struct loopback *loopback = substream->private_data; | |
1186 | struct loopback_pcm *dpcm; | |
9685347a | 1187 | struct loopback_cable *cable = NULL; |
597603d6 JK |
1188 | int err = 0; |
1189 | int dev = get_cable_index(substream); | |
1190 | ||
1191 | mutex_lock(&loopback->cable_lock); | |
1192 | dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL); | |
1193 | if (!dpcm) { | |
1194 | err = -ENOMEM; | |
1195 | goto unlock; | |
1196 | } | |
1197 | dpcm->loopback = loopback; | |
1198 | dpcm->substream = substream; | |
597603d6 JK |
1199 | |
1200 | cable = loopback->cables[substream->number][dev]; | |
1201 | if (!cable) { | |
1202 | cable = kzalloc(sizeof(*cable), GFP_KERNEL); | |
1203 | if (!cable) { | |
597603d6 JK |
1204 | err = -ENOMEM; |
1205 | goto unlock; | |
1206 | } | |
1207 | spin_lock_init(&cable->lock); | |
1208 | cable->hw = loopback_pcm_hardware; | |
26c53379 TW |
1209 | if (loopback->timer_source) |
1210 | cable->ops = &loopback_snd_timer_ops; | |
1211 | else | |
1212 | cable->ops = &loopback_jiffies_timer_ops; | |
597603d6 JK |
1213 | loopback->cables[substream->number][dev] = cable; |
1214 | } | |
1215 | dpcm->cable = cable; | |
133f3759 TW |
1216 | runtime->private_data = dpcm; |
1217 | ||
1218 | if (cable->ops->open) { | |
1219 | err = cable->ops->open(dpcm); | |
1220 | if (err < 0) | |
1221 | goto unlock; | |
1222 | } | |
597603d6 JK |
1223 | |
1224 | snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); | |
1225 | ||
b1c73fc8 JK |
1226 | /* use dynamic rules based on actual runtime->hw values */ |
1227 | /* note that the default rules created in the PCM midlevel code */ | |
1228 | /* are cached -> they do not reflect the actual state */ | |
1229 | err = snd_pcm_hw_rule_add(runtime, 0, | |
1230 | SNDRV_PCM_HW_PARAM_FORMAT, | |
898dfe46 | 1231 | rule_format, dpcm, |
b1c73fc8 JK |
1232 | SNDRV_PCM_HW_PARAM_FORMAT, -1); |
1233 | if (err < 0) | |
1234 | goto unlock; | |
1235 | err = snd_pcm_hw_rule_add(runtime, 0, | |
1236 | SNDRV_PCM_HW_PARAM_RATE, | |
898dfe46 | 1237 | rule_rate, dpcm, |
b1c73fc8 JK |
1238 | SNDRV_PCM_HW_PARAM_RATE, -1); |
1239 | if (err < 0) | |
1240 | goto unlock; | |
1241 | err = snd_pcm_hw_rule_add(runtime, 0, | |
1242 | SNDRV_PCM_HW_PARAM_CHANNELS, | |
898dfe46 | 1243 | rule_channels, dpcm, |
b1c73fc8 JK |
1244 | SNDRV_PCM_HW_PARAM_CHANNELS, -1); |
1245 | if (err < 0) | |
1246 | goto unlock; | |
1247 | ||
26c53379 TW |
1248 | /* In case of sound timer the period time of both devices of the same |
1249 | * loop has to be the same. | |
1250 | * This rule only takes effect if a sound timer was chosen | |
1251 | */ | |
1252 | if (cable->snd_timer.instance) { | |
1253 | err = snd_pcm_hw_rule_add(runtime, 0, | |
1254 | SNDRV_PCM_HW_PARAM_PERIOD_BYTES, | |
1255 | rule_period_bytes, dpcm, | |
1256 | SNDRV_PCM_HW_PARAM_PERIOD_BYTES, -1); | |
1257 | if (err < 0) | |
1258 | goto unlock; | |
1259 | } | |
1260 | ||
133f3759 TW |
1261 | /* loopback_runtime_free() has not to be called if kfree(dpcm) was |
1262 | * already called here. Otherwise it will end up with a double free. | |
1263 | */ | |
597603d6 | 1264 | runtime->private_free = loopback_runtime_free; |
b1c73fc8 | 1265 | if (get_notify(dpcm)) |
597603d6 | 1266 | runtime->hw = loopback_pcm_hardware; |
b1c73fc8 | 1267 | else |
597603d6 | 1268 | runtime->hw = cable->hw; |
8e6b1a72 TI |
1269 | |
1270 | spin_lock_irq(&cable->lock); | |
1271 | cable->streams[substream->stream] = dpcm; | |
1272 | spin_unlock_irq(&cable->lock); | |
1273 | ||
597603d6 | 1274 | unlock: |
9685347a TI |
1275 | if (err < 0) { |
1276 | free_cable(substream); | |
1277 | kfree(dpcm); | |
1278 | } | |
597603d6 JK |
1279 | mutex_unlock(&loopback->cable_lock); |
1280 | return err; | |
1281 | } | |
1282 | ||
1283 | static int loopback_close(struct snd_pcm_substream *substream) | |
1284 | { | |
1285 | struct loopback *loopback = substream->private_data; | |
1286 | struct loopback_pcm *dpcm = substream->runtime->private_data; | |
133f3759 | 1287 | int err = 0; |
597603d6 | 1288 | |
133f3759 TW |
1289 | if (dpcm->cable->ops->close_substream) |
1290 | err = dpcm->cable->ops->close_substream(dpcm); | |
597603d6 | 1291 | mutex_lock(&loopback->cable_lock); |
9685347a | 1292 | free_cable(substream); |
597603d6 | 1293 | mutex_unlock(&loopback->cable_lock); |
133f3759 | 1294 | return err; |
597603d6 JK |
1295 | } |
1296 | ||
9f88058e | 1297 | static const struct snd_pcm_ops loopback_pcm_ops = { |
597603d6 JK |
1298 | .open = loopback_open, |
1299 | .close = loopback_close, | |
597603d6 JK |
1300 | .hw_free = loopback_hw_free, |
1301 | .prepare = loopback_prepare, | |
1302 | .trigger = loopback_trigger, | |
1303 | .pointer = loopback_pointer, | |
1304 | }; | |
1305 | ||
fbbb01a1 BP |
1306 | static int loopback_pcm_new(struct loopback *loopback, |
1307 | int device, int substreams) | |
597603d6 JK |
1308 | { |
1309 | struct snd_pcm *pcm; | |
1310 | int err; | |
1311 | ||
1312 | err = snd_pcm_new(loopback->card, "Loopback PCM", device, | |
1313 | substreams, substreams, &pcm); | |
1314 | if (err < 0) | |
1315 | return err; | |
9f88058e TI |
1316 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &loopback_pcm_ops); |
1317 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &loopback_pcm_ops); | |
39729889 | 1318 | snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0); |
597603d6 JK |
1319 | |
1320 | pcm->private_data = loopback; | |
1321 | pcm->info_flags = 0; | |
1322 | strcpy(pcm->name, "Loopback PCM"); | |
1323 | ||
1324 | loopback->pcm[device] = pcm; | |
597603d6 JK |
1325 | return 0; |
1326 | } | |
1327 | ||
1328 | static int loopback_rate_shift_info(struct snd_kcontrol *kcontrol, | |
1329 | struct snd_ctl_elem_info *uinfo) | |
1330 | { | |
1331 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; | |
1332 | uinfo->count = 1; | |
1333 | uinfo->value.integer.min = 80000; | |
1334 | uinfo->value.integer.max = 120000; | |
1335 | uinfo->value.integer.step = 1; | |
1336 | return 0; | |
1337 | } | |
1338 | ||
1339 | static int loopback_rate_shift_get(struct snd_kcontrol *kcontrol, | |
1340 | struct snd_ctl_elem_value *ucontrol) | |
1341 | { | |
1342 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
1343 | ||
76b3421b | 1344 | mutex_lock(&loopback->cable_lock); |
597603d6 JK |
1345 | ucontrol->value.integer.value[0] = |
1346 | loopback->setup[kcontrol->id.subdevice] | |
1347 | [kcontrol->id.device].rate_shift; | |
76b3421b | 1348 | mutex_unlock(&loopback->cable_lock); |
597603d6 JK |
1349 | return 0; |
1350 | } | |
1351 | ||
1352 | static int loopback_rate_shift_put(struct snd_kcontrol *kcontrol, | |
1353 | struct snd_ctl_elem_value *ucontrol) | |
1354 | { | |
1355 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
1356 | unsigned int val; | |
1357 | int change = 0; | |
1358 | ||
1359 | val = ucontrol->value.integer.value[0]; | |
1360 | if (val < 80000) | |
1361 | val = 80000; | |
1362 | if (val > 120000) | |
1363 | val = 120000; | |
1364 | mutex_lock(&loopback->cable_lock); | |
1365 | if (val != loopback->setup[kcontrol->id.subdevice] | |
1366 | [kcontrol->id.device].rate_shift) { | |
1367 | loopback->setup[kcontrol->id.subdevice] | |
1368 | [kcontrol->id.device].rate_shift = val; | |
1369 | change = 1; | |
1370 | } | |
1371 | mutex_unlock(&loopback->cable_lock); | |
1372 | return change; | |
1373 | } | |
1374 | ||
1375 | static int loopback_notify_get(struct snd_kcontrol *kcontrol, | |
1376 | struct snd_ctl_elem_value *ucontrol) | |
1377 | { | |
1378 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
1379 | ||
76b3421b | 1380 | mutex_lock(&loopback->cable_lock); |
597603d6 JK |
1381 | ucontrol->value.integer.value[0] = |
1382 | loopback->setup[kcontrol->id.subdevice] | |
1383 | [kcontrol->id.device].notify; | |
76b3421b | 1384 | mutex_unlock(&loopback->cable_lock); |
597603d6 JK |
1385 | return 0; |
1386 | } | |
1387 | ||
1388 | static int loopback_notify_put(struct snd_kcontrol *kcontrol, | |
1389 | struct snd_ctl_elem_value *ucontrol) | |
1390 | { | |
1391 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
1392 | unsigned int val; | |
1393 | int change = 0; | |
1394 | ||
1395 | val = ucontrol->value.integer.value[0] ? 1 : 0; | |
76b3421b | 1396 | mutex_lock(&loopback->cable_lock); |
597603d6 JK |
1397 | if (val != loopback->setup[kcontrol->id.subdevice] |
1398 | [kcontrol->id.device].notify) { | |
1399 | loopback->setup[kcontrol->id.subdevice] | |
1400 | [kcontrol->id.device].notify = val; | |
1401 | change = 1; | |
1402 | } | |
76b3421b | 1403 | mutex_unlock(&loopback->cable_lock); |
597603d6 JK |
1404 | return change; |
1405 | } | |
1406 | ||
1407 | static int loopback_active_get(struct snd_kcontrol *kcontrol, | |
1408 | struct snd_ctl_elem_value *ucontrol) | |
1409 | { | |
1410 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
76b3421b TI |
1411 | struct loopback_cable *cable; |
1412 | ||
597603d6 JK |
1413 | unsigned int val = 0; |
1414 | ||
76b3421b TI |
1415 | mutex_lock(&loopback->cable_lock); |
1416 | cable = loopback->cables[kcontrol->id.subdevice][kcontrol->id.device ^ 1]; | |
306a4f3c RR |
1417 | if (cable != NULL) { |
1418 | unsigned int running = cable->running ^ cable->pause; | |
1419 | ||
1420 | val = (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ? 1 : 0; | |
1421 | } | |
76b3421b | 1422 | mutex_unlock(&loopback->cable_lock); |
597603d6 JK |
1423 | ucontrol->value.integer.value[0] = val; |
1424 | return 0; | |
1425 | } | |
1426 | ||
1427 | static int loopback_format_info(struct snd_kcontrol *kcontrol, | |
1428 | struct snd_ctl_elem_info *uinfo) | |
1429 | { | |
1430 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; | |
1431 | uinfo->count = 1; | |
1432 | uinfo->value.integer.min = 0; | |
8c356c52 | 1433 | uinfo->value.integer.max = (__force int)SNDRV_PCM_FORMAT_LAST; |
597603d6 JK |
1434 | uinfo->value.integer.step = 1; |
1435 | return 0; | |
1436 | } | |
1437 | ||
1438 | static int loopback_format_get(struct snd_kcontrol *kcontrol, | |
1439 | struct snd_ctl_elem_value *ucontrol) | |
1440 | { | |
1441 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
1442 | ||
1443 | ucontrol->value.integer.value[0] = | |
8c356c52 | 1444 | (__force int)loopback->setup[kcontrol->id.subdevice] |
597603d6 JK |
1445 | [kcontrol->id.device].format; |
1446 | return 0; | |
1447 | } | |
1448 | ||
1449 | static int loopback_rate_info(struct snd_kcontrol *kcontrol, | |
1450 | struct snd_ctl_elem_info *uinfo) | |
1451 | { | |
1452 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; | |
1453 | uinfo->count = 1; | |
1454 | uinfo->value.integer.min = 0; | |
1455 | uinfo->value.integer.max = 192000; | |
1456 | uinfo->value.integer.step = 1; | |
1457 | return 0; | |
1458 | } | |
1459 | ||
1460 | static int loopback_rate_get(struct snd_kcontrol *kcontrol, | |
1461 | struct snd_ctl_elem_value *ucontrol) | |
1462 | { | |
1463 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
1464 | ||
76b3421b | 1465 | mutex_lock(&loopback->cable_lock); |
597603d6 JK |
1466 | ucontrol->value.integer.value[0] = |
1467 | loopback->setup[kcontrol->id.subdevice] | |
1468 | [kcontrol->id.device].rate; | |
76b3421b | 1469 | mutex_unlock(&loopback->cable_lock); |
597603d6 JK |
1470 | return 0; |
1471 | } | |
1472 | ||
1473 | static int loopback_channels_info(struct snd_kcontrol *kcontrol, | |
1474 | struct snd_ctl_elem_info *uinfo) | |
1475 | { | |
1476 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; | |
1477 | uinfo->count = 1; | |
1478 | uinfo->value.integer.min = 1; | |
1479 | uinfo->value.integer.max = 1024; | |
1480 | uinfo->value.integer.step = 1; | |
1481 | return 0; | |
1482 | } | |
1483 | ||
1484 | static int loopback_channels_get(struct snd_kcontrol *kcontrol, | |
1485 | struct snd_ctl_elem_value *ucontrol) | |
1486 | { | |
1487 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
1488 | ||
76b3421b | 1489 | mutex_lock(&loopback->cable_lock); |
597603d6 JK |
1490 | ucontrol->value.integer.value[0] = |
1491 | loopback->setup[kcontrol->id.subdevice] | |
1446c5fb | 1492 | [kcontrol->id.device].channels; |
76b3421b | 1493 | mutex_unlock(&loopback->cable_lock); |
597603d6 JK |
1494 | return 0; |
1495 | } | |
1496 | ||
2eccd408 | 1497 | static const struct snd_kcontrol_new loopback_controls[] = { |
597603d6 JK |
1498 | { |
1499 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
1500 | .name = "PCM Rate Shift 100000", | |
1501 | .info = loopback_rate_shift_info, | |
1502 | .get = loopback_rate_shift_get, | |
1503 | .put = loopback_rate_shift_put, | |
1504 | }, | |
1505 | { | |
1506 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
1507 | .name = "PCM Notify", | |
1508 | .info = snd_ctl_boolean_mono_info, | |
1509 | .get = loopback_notify_get, | |
1510 | .put = loopback_notify_put, | |
1511 | }, | |
1512 | #define ACTIVE_IDX 2 | |
1513 | { | |
1514 | .access = SNDRV_CTL_ELEM_ACCESS_READ, | |
1515 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
1516 | .name = "PCM Slave Active", | |
1517 | .info = snd_ctl_boolean_mono_info, | |
1518 | .get = loopback_active_get, | |
1519 | }, | |
1520 | #define FORMAT_IDX 3 | |
1521 | { | |
1522 | .access = SNDRV_CTL_ELEM_ACCESS_READ, | |
1523 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
1524 | .name = "PCM Slave Format", | |
1525 | .info = loopback_format_info, | |
1526 | .get = loopback_format_get | |
1527 | }, | |
1528 | #define RATE_IDX 4 | |
1529 | { | |
1530 | .access = SNDRV_CTL_ELEM_ACCESS_READ, | |
1531 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
1532 | .name = "PCM Slave Rate", | |
1533 | .info = loopback_rate_info, | |
1534 | .get = loopback_rate_get | |
1535 | }, | |
1536 | #define CHANNELS_IDX 5 | |
1537 | { | |
1538 | .access = SNDRV_CTL_ELEM_ACCESS_READ, | |
1539 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
1540 | .name = "PCM Slave Channels", | |
1541 | .info = loopback_channels_info, | |
1542 | .get = loopback_channels_get | |
1543 | } | |
1544 | }; | |
1545 | ||
fbbb01a1 | 1546 | static int loopback_mixer_new(struct loopback *loopback, int notify) |
597603d6 JK |
1547 | { |
1548 | struct snd_card *card = loopback->card; | |
1549 | struct snd_pcm *pcm; | |
1550 | struct snd_kcontrol *kctl; | |
1551 | struct loopback_setup *setup; | |
1552 | int err, dev, substr, substr_count, idx; | |
1553 | ||
1554 | strcpy(card->mixername, "Loopback Mixer"); | |
1555 | for (dev = 0; dev < 2; dev++) { | |
1556 | pcm = loopback->pcm[dev]; | |
1557 | substr_count = | |
1558 | pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count; | |
1559 | for (substr = 0; substr < substr_count; substr++) { | |
1560 | setup = &loopback->setup[substr][dev]; | |
1561 | setup->notify = notify; | |
1562 | setup->rate_shift = NO_PITCH; | |
1563 | setup->format = SNDRV_PCM_FORMAT_S16_LE; | |
1564 | setup->rate = 48000; | |
1565 | setup->channels = 2; | |
1566 | for (idx = 0; idx < ARRAY_SIZE(loopback_controls); | |
1567 | idx++) { | |
1568 | kctl = snd_ctl_new1(&loopback_controls[idx], | |
1569 | loopback); | |
1570 | if (!kctl) | |
1571 | return -ENOMEM; | |
1572 | kctl->id.device = dev; | |
1573 | kctl->id.subdevice = substr; | |
168632a4 JH |
1574 | |
1575 | /* Add the control before copying the id so that | |
1576 | * the numid field of the id is set in the copy. | |
1577 | */ | |
1578 | err = snd_ctl_add(card, kctl); | |
1579 | if (err < 0) | |
1580 | return err; | |
1581 | ||
597603d6 JK |
1582 | switch (idx) { |
1583 | case ACTIVE_IDX: | |
1584 | setup->active_id = kctl->id; | |
1585 | break; | |
1586 | case FORMAT_IDX: | |
1587 | setup->format_id = kctl->id; | |
1588 | break; | |
1589 | case RATE_IDX: | |
1590 | setup->rate_id = kctl->id; | |
1591 | break; | |
1592 | case CHANNELS_IDX: | |
1593 | setup->channels_id = kctl->id; | |
1594 | break; | |
1595 | default: | |
1596 | break; | |
1597 | } | |
597603d6 JK |
1598 | } |
1599 | } | |
1600 | } | |
1601 | return 0; | |
1602 | } | |
1603 | ||
e74670b6 JK |
1604 | static void print_dpcm_info(struct snd_info_buffer *buffer, |
1605 | struct loopback_pcm *dpcm, | |
1606 | const char *id) | |
1607 | { | |
1608 | snd_iprintf(buffer, " %s\n", id); | |
1609 | if (dpcm == NULL) { | |
1610 | snd_iprintf(buffer, " inactive\n"); | |
1611 | return; | |
1612 | } | |
1613 | snd_iprintf(buffer, " buffer_size:\t%u\n", dpcm->pcm_buffer_size); | |
1614 | snd_iprintf(buffer, " buffer_pos:\t\t%u\n", dpcm->buf_pos); | |
1615 | snd_iprintf(buffer, " silent_size:\t%u\n", dpcm->silent_size); | |
1616 | snd_iprintf(buffer, " period_size:\t%u\n", dpcm->pcm_period_size); | |
1617 | snd_iprintf(buffer, " bytes_per_sec:\t%u\n", dpcm->pcm_bps); | |
1618 | snd_iprintf(buffer, " sample_align:\t%u\n", dpcm->pcm_salign); | |
1619 | snd_iprintf(buffer, " rate_shift:\t\t%u\n", dpcm->pcm_rate_shift); | |
133f3759 TW |
1620 | if (dpcm->cable->ops->dpcm_info) |
1621 | dpcm->cable->ops->dpcm_info(dpcm, buffer); | |
e74670b6 JK |
1622 | } |
1623 | ||
1624 | static void print_substream_info(struct snd_info_buffer *buffer, | |
1625 | struct loopback *loopback, | |
1626 | int sub, | |
1627 | int num) | |
1628 | { | |
1629 | struct loopback_cable *cable = loopback->cables[sub][num]; | |
1630 | ||
1631 | snd_iprintf(buffer, "Cable %i substream %i:\n", num, sub); | |
1632 | if (cable == NULL) { | |
1633 | snd_iprintf(buffer, " inactive\n"); | |
1634 | return; | |
1635 | } | |
1636 | snd_iprintf(buffer, " valid: %u\n", cable->valid); | |
1637 | snd_iprintf(buffer, " running: %u\n", cable->running); | |
5de9e45f | 1638 | snd_iprintf(buffer, " pause: %u\n", cable->pause); |
e74670b6 JK |
1639 | print_dpcm_info(buffer, cable->streams[0], "Playback"); |
1640 | print_dpcm_info(buffer, cable->streams[1], "Capture"); | |
1641 | } | |
1642 | ||
1643 | static void print_cable_info(struct snd_info_entry *entry, | |
1644 | struct snd_info_buffer *buffer) | |
1645 | { | |
1646 | struct loopback *loopback = entry->private_data; | |
1647 | int sub, num; | |
1648 | ||
1649 | mutex_lock(&loopback->cable_lock); | |
1650 | num = entry->name[strlen(entry->name)-1]; | |
1651 | num = num == '0' ? 0 : 1; | |
1652 | for (sub = 0; sub < MAX_PCM_SUBSTREAMS; sub++) | |
1653 | print_substream_info(buffer, loopback, sub, num); | |
1654 | mutex_unlock(&loopback->cable_lock); | |
1655 | } | |
1656 | ||
c6ae9960 | 1657 | static int loopback_cable_proc_new(struct loopback *loopback, int cidx) |
e74670b6 JK |
1658 | { |
1659 | char name[32]; | |
e74670b6 JK |
1660 | |
1661 | snprintf(name, sizeof(name), "cable#%d", cidx); | |
815d808c TI |
1662 | return snd_card_ro_proc_new(loopback->card, name, loopback, |
1663 | print_cable_info); | |
e74670b6 JK |
1664 | } |
1665 | ||
26c53379 TW |
1666 | static void loopback_set_timer_source(struct loopback *loopback, |
1667 | const char *value) | |
1668 | { | |
1669 | if (loopback->timer_source) { | |
1670 | devm_kfree(loopback->card->dev, loopback->timer_source); | |
1671 | loopback->timer_source = NULL; | |
1672 | } | |
1673 | if (value && *value) | |
1674 | loopback->timer_source = devm_kstrdup(loopback->card->dev, | |
1675 | value, GFP_KERNEL); | |
1676 | } | |
1677 | ||
c6ae9960 AG |
1678 | static void print_timer_source_info(struct snd_info_entry *entry, |
1679 | struct snd_info_buffer *buffer) | |
1680 | { | |
1681 | struct loopback *loopback = entry->private_data; | |
1682 | ||
1683 | mutex_lock(&loopback->cable_lock); | |
1684 | snd_iprintf(buffer, "%s\n", | |
1685 | loopback->timer_source ? loopback->timer_source : ""); | |
1686 | mutex_unlock(&loopback->cable_lock); | |
1687 | } | |
1688 | ||
1689 | static void change_timer_source_info(struct snd_info_entry *entry, | |
1690 | struct snd_info_buffer *buffer) | |
1691 | { | |
1692 | struct loopback *loopback = entry->private_data; | |
1693 | char line[64]; | |
1694 | ||
1695 | mutex_lock(&loopback->cable_lock); | |
1696 | if (!snd_info_get_line(buffer, line, sizeof(line))) | |
1697 | loopback_set_timer_source(loopback, strim(line)); | |
1698 | mutex_unlock(&loopback->cable_lock); | |
1699 | } | |
1700 | ||
1701 | static int loopback_timer_source_proc_new(struct loopback *loopback) | |
1702 | { | |
1703 | return snd_card_rw_proc_new(loopback->card, "timer_source", loopback, | |
1704 | print_timer_source_info, | |
1705 | change_timer_source_info); | |
1706 | } | |
1707 | ||
fbbb01a1 | 1708 | static int loopback_probe(struct platform_device *devptr) |
597603d6 JK |
1709 | { |
1710 | struct snd_card *card; | |
1711 | struct loopback *loopback; | |
1712 | int dev = devptr->id; | |
1713 | int err; | |
1714 | ||
b072e65a TI |
1715 | err = snd_devm_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE, |
1716 | sizeof(struct loopback), &card); | |
597603d6 JK |
1717 | if (err < 0) |
1718 | return err; | |
1719 | loopback = card->private_data; | |
1720 | ||
1721 | if (pcm_substreams[dev] < 1) | |
1722 | pcm_substreams[dev] = 1; | |
1723 | if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS) | |
1724 | pcm_substreams[dev] = MAX_PCM_SUBSTREAMS; | |
1725 | ||
1726 | loopback->card = card; | |
26c53379 TW |
1727 | loopback_set_timer_source(loopback, timer_source[dev]); |
1728 | ||
597603d6 JK |
1729 | mutex_init(&loopback->cable_lock); |
1730 | ||
1731 | err = loopback_pcm_new(loopback, 0, pcm_substreams[dev]); | |
1732 | if (err < 0) | |
b072e65a | 1733 | return err; |
597603d6 JK |
1734 | err = loopback_pcm_new(loopback, 1, pcm_substreams[dev]); |
1735 | if (err < 0) | |
b072e65a | 1736 | return err; |
597603d6 JK |
1737 | err = loopback_mixer_new(loopback, pcm_notify[dev] ? 1 : 0); |
1738 | if (err < 0) | |
b072e65a | 1739 | return err; |
c6ae9960 AG |
1740 | loopback_cable_proc_new(loopback, 0); |
1741 | loopback_cable_proc_new(loopback, 1); | |
1742 | loopback_timer_source_proc_new(loopback); | |
597603d6 JK |
1743 | strcpy(card->driver, "Loopback"); |
1744 | strcpy(card->shortname, "Loopback"); | |
1745 | sprintf(card->longname, "Loopback %i", dev + 1); | |
1746 | err = snd_card_register(card); | |
b072e65a TI |
1747 | if (err < 0) |
1748 | return err; | |
1749 | platform_set_drvdata(devptr, card); | |
597603d6 JK |
1750 | return 0; |
1751 | } | |
1752 | ||
d34e4e00 | 1753 | #ifdef CONFIG_PM_SLEEP |
284e7ca7 | 1754 | static int loopback_suspend(struct device *pdev) |
597603d6 | 1755 | { |
284e7ca7 | 1756 | struct snd_card *card = dev_get_drvdata(pdev); |
597603d6 JK |
1757 | |
1758 | snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); | |
597603d6 JK |
1759 | return 0; |
1760 | } | |
1761 | ||
284e7ca7 | 1762 | static int loopback_resume(struct device *pdev) |
597603d6 | 1763 | { |
284e7ca7 | 1764 | struct snd_card *card = dev_get_drvdata(pdev); |
597603d6 JK |
1765 | |
1766 | snd_power_change_state(card, SNDRV_CTL_POWER_D0); | |
1767 | return 0; | |
1768 | } | |
284e7ca7 TI |
1769 | |
1770 | static SIMPLE_DEV_PM_OPS(loopback_pm, loopback_suspend, loopback_resume); | |
1771 | #define LOOPBACK_PM_OPS &loopback_pm | |
1772 | #else | |
1773 | #define LOOPBACK_PM_OPS NULL | |
597603d6 JK |
1774 | #endif |
1775 | ||
1776 | #define SND_LOOPBACK_DRIVER "snd_aloop" | |
1777 | ||
1778 | static struct platform_driver loopback_driver = { | |
1779 | .probe = loopback_probe, | |
597603d6 | 1780 | .driver = { |
8bf01d8a | 1781 | .name = SND_LOOPBACK_DRIVER, |
284e7ca7 | 1782 | .pm = LOOPBACK_PM_OPS, |
597603d6 JK |
1783 | }, |
1784 | }; | |
1785 | ||
1786 | static void loopback_unregister_all(void) | |
1787 | { | |
1788 | int i; | |
1789 | ||
1790 | for (i = 0; i < ARRAY_SIZE(devices); ++i) | |
1791 | platform_device_unregister(devices[i]); | |
1792 | platform_driver_unregister(&loopback_driver); | |
1793 | } | |
1794 | ||
1795 | static int __init alsa_card_loopback_init(void) | |
1796 | { | |
1797 | int i, err, cards; | |
1798 | ||
1799 | err = platform_driver_register(&loopback_driver); | |
1800 | if (err < 0) | |
1801 | return err; | |
1802 | ||
1803 | ||
1804 | cards = 0; | |
1805 | for (i = 0; i < SNDRV_CARDS; i++) { | |
1806 | struct platform_device *device; | |
1807 | if (!enable[i]) | |
1808 | continue; | |
1809 | device = platform_device_register_simple(SND_LOOPBACK_DRIVER, | |
1810 | i, NULL, 0); | |
1811 | if (IS_ERR(device)) | |
1812 | continue; | |
1813 | if (!platform_get_drvdata(device)) { | |
1814 | platform_device_unregister(device); | |
1815 | continue; | |
1816 | } | |
1817 | devices[i] = device; | |
1818 | cards++; | |
1819 | } | |
1820 | if (!cards) { | |
1821 | #ifdef MODULE | |
1822 | printk(KERN_ERR "aloop: No loopback enabled\n"); | |
1823 | #endif | |
1824 | loopback_unregister_all(); | |
1825 | return -ENODEV; | |
1826 | } | |
1827 | return 0; | |
1828 | } | |
1829 | ||
1830 | static void __exit alsa_card_loopback_exit(void) | |
1831 | { | |
1832 | loopback_unregister_all(); | |
1833 | } | |
1834 | ||
1835 | module_init(alsa_card_loopback_init) | |
1836 | module_exit(alsa_card_loopback_exit) |